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			<h1>Vue3  Ajax(axios)</h1>
<p>Vue 版本推荐使用 axios 来完成 ajax 请求。</p>
<p>Axios 是一个基于 Promise 的 HTTP 库，可以用在浏览器和 node.js 中。</p>

<p>Github开源地址： <a href="https://github.com/axios/axios" rel="noopener noreferrer" target="_blank">https://github.com/axios/axios</a></p>

<h3>安装方法</h3>


<p><strong>使用 cdn:</strong></p>

<pre>&lt;script src=""&gt;&lt;/script&gt;</pre>

<p>或 </p>

<pre>&lt;script src=""&gt;&lt;/script&gt;</pre>

<p><strong>使用 npm:</strong></p>

<pre>$ npm install axios</pre>
<p><strong>使用 bower:</strong></p>

<pre>$ bower install axios</pre>
<p><strong>使用 yarn:</strong></p>

<pre>$ yarn add axios</pre>
<p>使用方法：</p>
<pre>Vue.axios.get(api).then((response) =&gt; {
  console.log(response.data)
})

this.axios.get(api).then((response) =&gt; {
  console.log(response.data)
})

this.$http.get(api).then((response) =&gt; {
  console.log(response.data)
})</pre>
<h3>浏览器支持情况</h3>

<p><img decoding="async" src="https://www.runoob.com/wp-content/uploads/2019/05/2C4AD21F-C1DE-471F-A4A5-66AA01E11FFC.jpg"></p>
<hr>
<h2>GET 方法</h2>
<p>我们可以简单的读取 JSON 数据：</p>

<div class="example"><h2 class="example">GET 实例</h2> <div class="example_code"><div class="hl-main"><span class="hl-reserved">const</span><span class="hl-code"> </span><span class="hl-identifier">app</span><span class="hl-code"> = </span><span class="hl-brackets">{</span><span class="hl-code">
  </span><span class="hl-identifier">data</span><span class="hl-brackets">(</span><span class="hl-brackets">)</span><span class="hl-code"> </span><span class="hl-brackets">{</span><span class="hl-code">
    </span><span class="hl-reserved">return</span><span class="hl-code"> </span><span class="hl-brackets">{</span><span class="hl-code">
      </span><span class="hl-identifier">info</span><span class="hl-code">: </span><span class="hl-quotes">'</span><span class="hl-string">Ajax 测试!!</span><span class="hl-quotes">'</span><span class="hl-code">
    </span><span class="hl-brackets">}</span><span class="hl-code">
  </span><span class="hl-brackets">}</span><span class="hl-code">,
  </span><span class="hl-identifier">mounted</span><span class="hl-code"> </span><span class="hl-brackets">(</span><span class="hl-brackets">)</span><span class="hl-code"> </span><span class="hl-brackets">{</span><span class="hl-code">
    </span><span class="hl-identifier">axios</span><span class="hl-code">
      .</span><span class="hl-identifier">get</span><span class="hl-brackets">(</span><span class="hl-quotes">'</span><span class="hl-string">https://www.runoob.com/try/ajax/json_demo.json</span><span class="hl-quotes">'</span><span class="hl-brackets">)</span><span class="hl-code">
      .</span><span class="hl-identifier">then</span><span class="hl-brackets">(</span><span class="hl-identifier">response</span><span class="hl-code"> =&gt; </span><span class="hl-brackets">(</span><span class="hl-reserved">this</span><span class="hl-code">.</span><span class="hl-identifier">info</span><span class="hl-code"> = </span><span class="hl-identifier">response</span><span class="hl-brackets">)</span><span class="hl-brackets">)</span><span class="hl-code">
      .</span><span class="hl-reserved">catch</span><span class="hl-brackets">(</span><span class="hl-reserved">function</span><span class="hl-code"> </span><span class="hl-brackets">(</span><span class="hl-identifier">error</span><span class="hl-brackets">)</span><span class="hl-code"> </span><span class="hl-brackets">{</span><span class="hl-code"> </span><span class="hl-comment">//</span><span class="hl-comment"> 请求失败处理</span><span class="hl-comment"></span><span class="hl-code">
        </span><span class="hl-identifier">console</span><span class="hl-code">.</span><span class="hl-identifier">log</span><span class="hl-brackets">(</span><span class="hl-identifier">error</span><span class="hl-brackets">)</span><span class="hl-code">;
    </span><span class="hl-brackets">}</span><span class="hl-brackets">)</span><span class="hl-code">;
  </span><span class="hl-brackets">}</span><span class="hl-code">
</span><span class="hl-brackets">}</span><span class="hl-code">
 
</span><span class="hl-identifier">Vue</span><span class="hl-code">.</span><span class="hl-identifier">createApp</span><span class="hl-brackets">(</span><span class="hl-identifier">app</span><span class="hl-brackets">)</span><span class="hl-code">.</span><span class="hl-identifier">mount</span><span class="hl-brackets">(</span><span class="hl-quotes">'</span><span class="hl-string">#app</span><span class="hl-quotes">'</span><span class="hl-brackets">)</span></div></div>
<br>
<a target="_blank" href="../try/try.php?filename=vue3-ajax-axios" class="tryitbtn" rel="noopener noreferrer">尝试一下 »</a>

</div>



<p>使用 <span class="marked">response.data</span> 读取 JSON 数据：</p>

<div class="example"><h2 class="example">GET 实例</h2> <div class="example_code"><div class="hl-main"><span class="hl-brackets">&lt;</span><span class="hl-reserved">div</span><span class="hl-code"> </span><span class="hl-var">id</span><span class="hl-code">=</span><span class="hl-quotes">&quot;</span><span class="hl-string">app</span><span class="hl-quotes">&quot;</span><span class="hl-brackets">&gt;</span><span class="hl-code">
  </span><span class="hl-brackets">&lt;</span><span class="hl-reserved">h1</span><span class="hl-brackets">&gt;</span><span class="hl-code">网站列表</span><span class="hl-brackets">&lt;/</span><span class="hl-reserved">h1</span><span class="hl-brackets">&gt;</span><span class="hl-code">
  </span><span class="hl-brackets">&lt;</span><span class="hl-reserved">div</span><span class="hl-code">
    </span><span class="hl-var">v-for</span><span class="hl-code">=</span><span class="hl-quotes">&quot;</span><span class="hl-string">site in info</span><span class="hl-quotes">&quot;</span><span class="hl-code">
  </span><span class="hl-brackets">&gt;</span><span class="hl-code">
    {{ site.name }}
  </span><span class="hl-brackets">&lt;/</span><span class="hl-reserved">div</span><span class="hl-brackets">&gt;</span><span class="hl-code">
</span><span class="hl-brackets">&lt;/</span><span class="hl-reserved">div</span><span class="hl-brackets">&gt;</span><span class="hl-code">
</span><span class="hl-brackets">&lt;</span><span class="hl-reserved">script</span><span class="hl-code"> </span><span class="hl-var">type</span><span class="hl-code"> = </span><span class="hl-quotes">&quot;</span><span class="hl-string">text/javascript</span><span class="hl-quotes">&quot;</span><span class="hl-brackets">&gt;</span><span class="hl-code">
const app = {
  data() {
    return {
      info: 'Ajax 测试!!'
    }
  },
  mounted () {
    axios
      .get('https://www.runoob.com/try/ajax/json_demo.json')
      .then(response =&gt; (this.info = response))
      .catch(function (error) { // 请求失败处理
        console.log(error);
    });
  }
}
 
Vue.createApp(app).mount('#app')
</span><span class="hl-brackets">&lt;/</span><span class="hl-reserved">script</span><span class="hl-brackets">&gt;</span></div></div>
<br>
<a target="_blank" href="../try/try.php?filename=vue3-ajax-axios3" class="tryitbtn" rel="noopener noreferrer">尝试一下 »</a>

</div>


<p>GET 方法传递参数格式如下：</p>
<div class="example"><h2 class="example">传递参数说明</h2> <div class="example_code"><div class="hl-main"><span class="hl-comment">//</span><span class="hl-comment"> 直接在 URL 上添加参数 ID=12345</span><span class="hl-comment"></span><span class="hl-code">
</span><span class="hl-identifier">axios</span><span class="hl-code">.</span><span class="hl-identifier">get</span><span class="hl-brackets">(</span><span class="hl-quotes">'</span><span class="hl-string">/user?ID=12345</span><span class="hl-quotes">'</span><span class="hl-brackets">)</span><span class="hl-code">
  .</span><span class="hl-identifier">then</span><span class="hl-brackets">(</span><span class="hl-reserved">function</span><span class="hl-code"> </span><span class="hl-brackets">(</span><span class="hl-identifier">response</span><span class="hl-brackets">)</span><span class="hl-code"> </span><span class="hl-brackets">{</span><span class="hl-code">
    </span><span class="hl-identifier">console</span><span class="hl-code">.</span><span class="hl-identifier">log</span><span class="hl-brackets">(</span><span class="hl-identifier">response</span><span class="hl-brackets">)</span><span class="hl-code">;
  </span><span class="hl-brackets">}</span><span class="hl-brackets">)</span><span class="hl-code">
  .</span><span class="hl-reserved">catch</span><span class="hl-brackets">(</span><span class="hl-reserved">function</span><span class="hl-code"> </span><span class="hl-brackets">(</span><span class="hl-identifier">error</span><span class="hl-brackets">)</span><span class="hl-code"> </span><span class="hl-brackets">{</span><span class="hl-code">
    </span><span class="hl-identifier">console</span><span class="hl-code">.</span><span class="hl-identifier">log</span><span class="hl-brackets">(</span><span class="hl-identifier">error</span><span class="hl-brackets">)</span><span class="hl-code">;
  </span><span class="hl-brackets">}</span><span class="hl-brackets">)</span><span class="hl-code">;
 
</span><span class="hl-comment">//</span><span class="hl-comment"> 也可以通过 params 设置参数：</span><span class="hl-comment"></span><span class="hl-code">
</span><span class="hl-identifier">axios</span><span class="hl-code">.</span><span class="hl-identifier">get</span><span class="hl-brackets">(</span><span class="hl-quotes">'</span><span class="hl-string">/user</span><span class="hl-quotes">'</span><span class="hl-code">, </span><span class="hl-brackets">{</span><span class="hl-code">
    </span><span class="hl-identifier">params</span><span class="hl-code">: </span><span class="hl-brackets">{</span><span class="hl-code">
      </span><span class="hl-identifier">ID</span><span class="hl-code">: </span><span class="hl-number">12345</span><span class="hl-code">
    </span><span class="hl-brackets">}</span><span class="hl-code">
  </span><span class="hl-brackets">}</span><span class="hl-brackets">)</span><span class="hl-code">
  .</span><span class="hl-identifier">then</span><span class="hl-brackets">(</span><span class="hl-reserved">function</span><span class="hl-code"> </span><span class="hl-brackets">(</span><span class="hl-identifier">response</span><span class="hl-brackets">)</span><span class="hl-code"> </span><span class="hl-brackets">{</span><span class="hl-code">
    </span><span class="hl-identifier">console</span><span class="hl-code">.</span><span class="hl-identifier">log</span><span class="hl-brackets">(</span><span class="hl-identifier">response</span><span class="hl-brackets">)</span><span class="hl-code">;
  </span><span class="hl-brackets">}</span><span class="hl-brackets">)</span><span class="hl-code">
  .</span><span class="hl-reserved">catch</span><span class="hl-brackets">(</span><span class="hl-reserved">function</span><span class="hl-code"> </span><span class="hl-brackets">(</span><span class="hl-identifier">error</span><span class="hl-brackets">)</span><span class="hl-code"> </span><span class="hl-brackets">{</span><span class="hl-code">
    </span><span class="hl-identifier">console</span><span class="hl-code">.</span><span class="hl-identifier">log</span><span class="hl-brackets">(</span><span class="hl-identifier">error</span><span class="hl-brackets">)</span><span class="hl-code">;
  </span><span class="hl-brackets">}</span><span class="hl-brackets">)</span><span class="hl-code">;</span></div></div></div><hr>
<h2>POST 方法</h2>
<div class="example"><h2 class="example">POST 实例</h2> <div class="example_code"><div class="hl-main"><span class="hl-reserved">const</span><span class="hl-code"> </span><span class="hl-identifier">app</span><span class="hl-code"> = </span><span class="hl-brackets">{</span><span class="hl-code">
  </span><span class="hl-identifier">data</span><span class="hl-brackets">(</span><span class="hl-brackets">)</span><span class="hl-code"> </span><span class="hl-brackets">{</span><span class="hl-code">
    </span><span class="hl-reserved">return</span><span class="hl-code"> </span><span class="hl-brackets">{</span><span class="hl-code">
      </span><span class="hl-identifier">info</span><span class="hl-code">: </span><span class="hl-reserved">null</span><span class="hl-code">
    </span><span class="hl-brackets">}</span><span class="hl-code">
  </span><span class="hl-brackets">}</span><span class="hl-code">,
  </span><span class="hl-identifier">mounted</span><span class="hl-code"> </span><span class="hl-brackets">(</span><span class="hl-brackets">)</span><span class="hl-code"> </span><span class="hl-brackets">{</span><span class="hl-code">
    </span><span class="hl-identifier">axios</span><span class="hl-code">
      .</span><span class="hl-identifier">post</span><span class="hl-brackets">(</span><span class="hl-quotes">'</span><span class="hl-string">https://www.runoob.com/try/ajax/demo_axios_post.php</span><span class="hl-quotes">'</span><span class="hl-brackets">)</span><span class="hl-code">
      .</span><span class="hl-identifier">then</span><span class="hl-brackets">(</span><span class="hl-identifier">response</span><span class="hl-code"> =&gt; </span><span class="hl-brackets">(</span><span class="hl-reserved">this</span><span class="hl-code">.</span><span class="hl-identifier">info</span><span class="hl-code"> = </span><span class="hl-identifier">response</span><span class="hl-brackets">)</span><span class="hl-brackets">)</span><span class="hl-code">
      .</span><span class="hl-reserved">catch</span><span class="hl-brackets">(</span><span class="hl-reserved">function</span><span class="hl-code"> </span><span class="hl-brackets">(</span><span class="hl-identifier">error</span><span class="hl-brackets">)</span><span class="hl-code"> </span><span class="hl-brackets">{</span><span class="hl-code"> </span><span class="hl-comment">//</span><span class="hl-comment"> 请求失败处理</span><span class="hl-comment"></span><span class="hl-code">
        </span><span class="hl-identifier">console</span><span class="hl-code">.</span><span class="hl-identifier">log</span><span class="hl-brackets">(</span><span class="hl-identifier">error</span><span class="hl-brackets">)</span><span class="hl-code">;
      </span><span class="hl-brackets">}</span><span class="hl-brackets">)</span><span class="hl-code">;
  </span><span class="hl-brackets">}</span><span class="hl-code">
</span><span class="hl-brackets">}</span><span class="hl-code">
 
</span><span class="hl-identifier">Vue</span><span class="hl-code">.</span><span class="hl-identifier">createApp</span><span class="hl-brackets">(</span><span class="hl-identifier">app</span><span class="hl-brackets">)</span><span class="hl-code">.</span><span class="hl-identifier">mount</span><span class="hl-brackets">(</span><span class="hl-quotes">'</span><span class="hl-string">#app</span><span class="hl-quotes">'</span><span class="hl-brackets">)</span></div></div>
<br>
<a target="_blank" href="../try/try.php?filename=vue3-ajax-axios2" class="tryitbtn" rel="noopener noreferrer">尝试一下 »</a>

</div>


<p>POST 方法传递参数格式如下：</p>
<div class="example"><h2 class="example">传递参数说明</h2> <div class="example_code"><div class="hl-main"><span class="hl-identifier">axios</span><span class="hl-code">.</span><span class="hl-identifier">post</span><span class="hl-brackets">(</span><span class="hl-quotes">'</span><span class="hl-string">/user</span><span class="hl-quotes">'</span><span class="hl-code">, </span><span class="hl-brackets">{</span><span class="hl-code">
    </span><span class="hl-identifier">firstName</span><span class="hl-code">: </span><span class="hl-quotes">'</span><span class="hl-string">Fred</span><span class="hl-quotes">'</span><span class="hl-code">,        </span><span class="hl-comment">//</span><span class="hl-comment"> 参数 firstName</span><span class="hl-comment"></span><span class="hl-code">
    </span><span class="hl-identifier">lastName</span><span class="hl-code">: </span><span class="hl-quotes">'</span><span class="hl-string">Flintstone</span><span class="hl-quotes">'</span><span class="hl-code">    </span><span class="hl-comment">//</span><span class="hl-comment"> 参数 lastName</span><span class="hl-comment"></span><span class="hl-code">
  </span><span class="hl-brackets">}</span><span class="hl-brackets">)</span><span class="hl-code">
  .</span><span class="hl-identifier">then</span><span class="hl-brackets">(</span><span class="hl-reserved">function</span><span class="hl-code"> </span><span class="hl-brackets">(</span><span class="hl-identifier">response</span><span class="hl-brackets">)</span><span class="hl-code"> </span><span class="hl-brackets">{</span><span class="hl-code">
    </span><span class="hl-identifier">console</span><span class="hl-code">.</span><span class="hl-identifier">log</span><span class="hl-brackets">(</span><span class="hl-identifier">response</span><span class="hl-brackets">)</span><span class="hl-code">;
  </span><span class="hl-brackets">}</span><span class="hl-brackets">)</span><span class="hl-code">
  .</span><span class="hl-reserved">catch</span><span class="hl-brackets">(</span><span class="hl-reserved">function</span><span class="hl-code"> </span><span class="hl-brackets">(</span><span class="hl-identifier">error</span><span class="hl-brackets">)</span><span class="hl-code"> </span><span class="hl-brackets">{</span><span class="hl-code">
    </span><span class="hl-identifier">console</span><span class="hl-code">.</span><span class="hl-identifier">log</span><span class="hl-brackets">(</span><span class="hl-identifier">error</span><span class="hl-brackets">)</span><span class="hl-code">;
  </span><span class="hl-brackets">}</span><span class="hl-brackets">)</span><span class="hl-code">;</span></div></div></div>

<hr>
<h2>执行多个并发请求</h2>

<div class="example"><h2 class="example">实例</h2> <div class="example_code"><div class="hl-main"><span class="hl-reserved">function</span><span class="hl-code"> </span><span class="hl-identifier">getUserAccount</span><span class="hl-brackets">(</span><span class="hl-brackets">)</span><span class="hl-code"> </span><span class="hl-brackets">{</span><span class="hl-code">
  </span><span class="hl-reserved">return</span><span class="hl-code"> </span><span class="hl-identifier">axios</span><span class="hl-code">.</span><span class="hl-identifier">get</span><span class="hl-brackets">(</span><span class="hl-quotes">'</span><span class="hl-string">/user/12345</span><span class="hl-quotes">'</span><span class="hl-brackets">)</span><span class="hl-code">;
</span><span class="hl-brackets">}</span><span class="hl-code">
 
</span><span class="hl-reserved">function</span><span class="hl-code"> </span><span class="hl-identifier">getUserPermissions</span><span class="hl-brackets">(</span><span class="hl-brackets">)</span><span class="hl-code"> </span><span class="hl-brackets">{</span><span class="hl-code">
  </span><span class="hl-reserved">return</span><span class="hl-code"> </span><span class="hl-identifier">axios</span><span class="hl-code">.</span><span class="hl-identifier">get</span><span class="hl-brackets">(</span><span class="hl-quotes">'</span><span class="hl-string">/user/12345/permissions</span><span class="hl-quotes">'</span><span class="hl-brackets">)</span><span class="hl-code">;
</span><span class="hl-brackets">}</span><span class="hl-code">
</span><span class="hl-identifier">axios</span><span class="hl-code">.</span><span class="hl-identifier">all</span><span class="hl-brackets">(</span><span class="hl-brackets">[</span><span class="hl-identifier">getUserAccount</span><span class="hl-brackets">(</span><span class="hl-brackets">)</span><span class="hl-code">, </span><span class="hl-identifier">getUserPermissions</span><span class="hl-brackets">(</span><span class="hl-brackets">)</span><span class="hl-brackets">]</span><span class="hl-brackets">)</span><span class="hl-code">
  .</span><span class="hl-identifier">then</span><span class="hl-brackets">(</span><span class="hl-identifier">axios</span><span class="hl-code">.</span><span class="hl-identifier">spread</span><span class="hl-brackets">(</span><span class="hl-reserved">function</span><span class="hl-code"> </span><span class="hl-brackets">(</span><span class="hl-identifier">acct</span><span class="hl-code">, </span><span class="hl-identifier">perms</span><span class="hl-brackets">)</span><span class="hl-code"> </span><span class="hl-brackets">{</span><span class="hl-code">
    </span><span class="hl-comment">//</span><span class="hl-comment"> 两个请求现在都执行完成</span><span class="hl-comment"></span><span class="hl-code">
  </span><span class="hl-brackets">}</span><span class="hl-brackets">)</span><span class="hl-brackets">)</span><span class="hl-code">;</span></div></div></div>

<hr>
<h2>axios API</h2>
<p>可以通过向 axios 传递相关配置来创建请求。</p>

<div class="example"><h2 class="example">实例</h2> <div class="example_code"><div class="hl-main"><span class="hl-identifier">axios</span><span class="hl-brackets">(</span><span class="hl-identifier">config</span><span class="hl-brackets">)</span><span class="hl-code">
</span><span class="hl-comment">//</span><span class="hl-comment"> 发送 POST 请求</span><span class="hl-comment"></span><span class="hl-code">
</span><span class="hl-identifier">axios</span><span class="hl-brackets">(</span><span class="hl-brackets">{</span><span class="hl-code">
  </span><span class="hl-identifier">method</span><span class="hl-code">: </span><span class="hl-quotes">'</span><span class="hl-string">post</span><span class="hl-quotes">'</span><span class="hl-code">,
  </span><span class="hl-identifier">url</span><span class="hl-code">: </span><span class="hl-quotes">'</span><span class="hl-string">/user/12345</span><span class="hl-quotes">'</span><span class="hl-code">,
  </span><span class="hl-identifier">data</span><span class="hl-code">: </span><span class="hl-brackets">{</span><span class="hl-code">
    </span><span class="hl-identifier">firstName</span><span class="hl-code">: </span><span class="hl-quotes">'</span><span class="hl-string">Fred</span><span class="hl-quotes">'</span><span class="hl-code">,
    </span><span class="hl-identifier">lastName</span><span class="hl-code">: </span><span class="hl-quotes">'</span><span class="hl-string">Flintstone</span><span class="hl-quotes">'</span><span class="hl-code">
  </span><span class="hl-brackets">}</span><span class="hl-code">
</span><span class="hl-brackets">}</span><span class="hl-brackets">)</span><span class="hl-code">;
</span><span class="hl-comment">//</span><span class="hl-comment">  GET 请求远程图片</span><span class="hl-comment"></span><span class="hl-code">
</span><span class="hl-identifier">axios</span><span class="hl-brackets">(</span><span class="hl-brackets">{</span><span class="hl-code">
  </span><span class="hl-identifier">method</span><span class="hl-code">:</span><span class="hl-quotes">'</span><span class="hl-string">get</span><span class="hl-quotes">'</span><span class="hl-code">,
  </span><span class="hl-identifier">url</span><span class="hl-code">:</span><span class="hl-quotes">'</span><span class="hl-string">http://bit.ly/2mTM3nY</span><span class="hl-quotes">'</span><span class="hl-code">,
  </span><span class="hl-identifier">responseType</span><span class="hl-code">:</span><span class="hl-quotes">'</span><span class="hl-string">stream</span><span class="hl-quotes">'</span><span class="hl-code">
</span><span class="hl-brackets">}</span><span class="hl-brackets">)</span><span class="hl-code">
  .</span><span class="hl-identifier">then</span><span class="hl-brackets">(</span><span class="hl-reserved">function</span><span class="hl-brackets">(</span><span class="hl-identifier">response</span><span class="hl-brackets">)</span><span class="hl-code"> </span><span class="hl-brackets">{</span><span class="hl-code">
  </span><span class="hl-identifier">response</span><span class="hl-code">.</span><span class="hl-identifier">data</span><span class="hl-code">.</span><span class="hl-identifier">pipe</span><span class="hl-brackets">(</span><span class="hl-identifier">fs</span><span class="hl-code">.</span><span class="hl-identifier">createWriteStream</span><span class="hl-brackets">(</span><span class="hl-quotes">'</span><span class="hl-string">ada_lovelace.jpg</span><span class="hl-quotes">'</span><span class="hl-brackets">)</span><span class="hl-brackets">)</span><span class="hl-code">
</span><span class="hl-brackets">}</span><span class="hl-brackets">)</span><span class="hl-code">;
</span><span class="hl-identifier">axios</span><span class="hl-brackets">(</span><span class="hl-identifier">url</span><span class="hl-brackets">[</span><span class="hl-code">, </span><span class="hl-identifier">config</span><span class="hl-brackets">]</span><span class="hl-brackets">)</span><span class="hl-code">
</span><span class="hl-comment">//</span><span class="hl-comment"> 发送 GET 请求（默认的方法）</span><span class="hl-comment"></span><span class="hl-code">
</span><span class="hl-identifier">axios</span><span class="hl-brackets">(</span><span class="hl-quotes">'</span><span class="hl-string">/user/12345</span><span class="hl-quotes">'</span><span class="hl-brackets">)</span><span class="hl-code">;</span></div></div></div>
<h3>请求方法的别名</h3>
<p>为方便使用，官方为所有支持的请求方法提供了别名，可以直接使用别名来发起请求：</p>

<pre>axios.request(config)
axios.get(url[, config])
axios.delete(url[, config])
axios.head(url[, config])
axios.post(url[, data[, config]])
axios.put(url[, data[, config]])
axios.patch(url[, data[, config]])</pre>
<p><strong>注意：</strong>在使用别名方法时， url、method、data 这些属性都不必在配置中指定。</p>

<h3>并发</h3>
<p>处理并发请求的助手函数：</p>

<pre>axios.all(iterable)
axios.spread(callback)</pre>
<h3>创建实例</h3>
<p>可以使用自定义配置新建一个 axios 实例：</p>

<pre>axios.create([config])
const instance = axios.create({
  baseURL: 'https://some-domain.com/api/',
  timeout: 1000,
  headers: {'X-Custom-Header': 'foobar'}
});</pre>
<h3>实例方法</h3>
<p>以下是可用的实例方法。指定的配置将与实例的配置合并：</p>

<pre>axios#request(config)
axios#get(url[, config])
axios#delete(url[, config])
axios#head(url[, config])
axios#post(url[, data[, config]])
axios#put(url[, data[, config]])
axios#patch(url[, data[, config]])</pre>
<h3>请求配置项</h3>
<p>下面是创建请求时可用的配置选项，注意只有 url 是必需的。如果没有指定 method，请求将默认使用 get 方法。</p>

<pre>{
  // `url` 是用于请求的服务器 URL
  url: "/user",

  // `method` 是创建请求时使用的方法
  method: "get", // 默认是 get

  // `baseURL` 将自动加在 `url` 前面，除非 `url` 是一个绝对 URL。
  // 它可以通过设置一个 `baseURL` 便于为 axios 实例的方法传递相对 URL
  baseURL: "https://some-domain.com/api/",

  // `transformRequest` 允许在向服务器发送前，修改请求数据
  // 只能用在 "PUT", "POST" 和 "PATCH" 这几个请求方法
  // 后面数组中的函数必须返回一个字符串，或 ArrayBuffer，或 Stream
  transformRequest: [function (data) {
    // 对 data 进行任意转换处理

    return data;
  }],

  // `transformResponse` 在传递给 then/catch 前，允许修改响应数据
  transformResponse: [function (data) {
    // 对 data 进行任意转换处理

    return data;
  }],

  // `headers` 是即将被发送的自定义请求头
  headers: {"X-Requested-With": "XMLHttpRequest"},

  // `params` 是即将与请求一起发送的 URL 参数
  // 必须是一个无格式对象(plain object)或 URLSearchParams 对象
  params: {
    ID: 12345
  },

  // `paramsSerializer` 是一个负责 `params` 序列化的函数
  // (e.g. https://www.npmjs.com/package/qs, http://api.jquery.com/jquery.param/)
  paramsSerializer: function(params) {
    return Qs.stringify(params, {arrayFormat: "brackets"})
  },

  // `data` 是作为请求主体被发送的数据
  // 只适用于这些请求方法 "PUT", "POST", 和 "PATCH"
  // 在没有设置 `transformRequest` 时，必须是以下类型之一：
  // - string, plain object, ArrayBuffer, ArrayBufferView, URLSearchParams
  // - 浏览器专属：FormData, File, Blob
  // - Node 专属： Stream
  data: {
    firstName: "Fred"
  },

  // `timeout` 指定请求超时的毫秒数(0 表示无超时时间)
  // 如果请求花费了超过 `timeout` 的时间，请求将被中断
  timeout: 1000,

  // `withCredentials` 表示跨域请求时是否需要使用凭证
  withCredentials: false, // 默认的

  // `adapter` 允许自定义处理请求，以使测试更轻松
  // 返回一个 promise 并应用一个有效的响应 (查阅 [response docs](#response-api)).
  adapter: function (config) {
    /* ... */
  },

  // `auth` 表示应该使用 HTTP 基础验证，并提供凭据
  // 这将设置一个 `Authorization` 头，覆写掉现有的任意使用 `headers` 设置的自定义 `Authorization`头
  auth: {
    username: "janedoe",
    password: "s00pers3cret"
  },

  // `responseType` 表示服务器响应的数据类型，可以是 "arraybuffer", "blob", "document", "json", "text", "stream"
  responseType: "json", // 默认的

  // `xsrfCookieName` 是用作 xsrf token 的值的cookie的名称
  xsrfCookieName: "XSRF-TOKEN", // default

  // `xsrfHeaderName` 是承载 xsrf token 的值的 HTTP 头的名称
  xsrfHeaderName: "X-XSRF-TOKEN", // 默认的

  // `onUploadProgress` 允许为上传处理进度事件
  onUploadProgress: function (progressEvent) {
    // 对原生进度事件的处理
  },

  // `onDownloadProgress` 允许为下载处理进度事件
  onDownloadProgress: function (progressEvent) {
    // 对原生进度事件的处理
  },

  // `maxContentLength` 定义允许的响应内容的最大尺寸
  maxContentLength: 2000,

  // `validateStatus` 定义对于给定的HTTP 响应状态码是 resolve 或 reject  promise 。如果 `validateStatus` 返回 `true` (或者设置为 `null` 或 `undefined`)，promise 将被 resolve; 否则，promise 将被 rejecte
  validateStatus: function (status) {
    return status &amp;gt;= 200 &amp;amp;&amp;amp; status &amp;lt; 300; // 默认的
  },

  // `maxRedirects` 定义在 node.js 中 follow 的最大重定向数目
  // 如果设置为0，将不会 follow 任何重定向
  maxRedirects: 5, // 默认的

  // `httpAgent` 和 `httpsAgent` 分别在 node.js 中用于定义在执行 http 和 https 时使用的自定义代理。允许像这样配置选项：
  // `keepAlive` 默认没有启用
  httpAgent: new http.Agent({ keepAlive: true }),
  httpsAgent: new https.Agent({ keepAlive: true }),

  // "proxy" 定义代理服务器的主机名称和端口
  // `auth` 表示 HTTP 基础验证应当用于连接代理，并提供凭据
  // 这将会设置一个 `Proxy-Authorization` 头，覆写掉已有的通过使用 `header` 设置的自定义 `Proxy-Authorization` 头。
  proxy: {
    host: "127.0.0.1",
    port: 9000,
    auth: : {
      username: "mikeymike",
      password: "rapunz3l"
    }
  },

  // `cancelToken` 指定用于取消请求的 cancel token
  // （查看后面的 Cancellation 这节了解更多）
  cancelToken: new CancelToken(function (cancel) {
  })
}</pre>
<h3>响应结构</h3>
<p>axios请求的响应包含以下信息：</p>

<pre>{
  // `data` 由服务器提供的响应
  data: {},

  // `status`  HTTP 状态码
  status: 200,

  // `statusText` 来自服务器响应的 HTTP 状态信息
  statusText: "OK",

  // `headers` 服务器响应的头
  headers: {},

  // `config` 是为请求提供的配置信息
  config: {}
}</pre>
<p>使用 then 时，会接收下面这样的响应：</p>

<pre>axios.get("/user/12345")
  .then(function(response) {
    console.log(response.data);
    console.log(response.status);
    console.log(response.statusText);
    console.log(response.headers);
    console.log(response.config);
  });</pre>

  <p>在使用 <code>catch</code> 时，或传递 <a href="https://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Global_Objects/Promise/then" target="_blank" rel="noopener noreferrer">rejection callback</a> 作为 <code>then</code> 的第二个参数时，响应可以通过 <code>error</code> 对象可被使用。</p>



<h3>配置的默认值</h3>
<p>你可以指定将被用在各个请求的配置默认值。</p>

<p>全局的 axios 默认值：</p>
<pre>axios.defaults.baseURL = 'https://api.example.com';
axios.defaults.headers.common['Authorization'] = AUTH_TOKEN;
axios.defaults.headers.post['Content-Type'] = 'application/x-www-form-urlencoded';</pre>
<p>自定义实例默认值：</p>
<pre>// 创建实例时设置配置的默认值
var instance = axios.create({
  baseURL: 'https://api.example.com'
});

// 在实例已创建后修改默认值
instance.defaults.headers.common['Authorization'] = AUTH_TOKEN;</pre>
<h3>配置的优先顺序</h3>
<p>配置会以一个优先顺序进行合并。这个顺序是：在 lib/defaults.js 找到的库的默认值，然后是实例的 defaults 属性，最后是请求的 config 参数。后者将优先于前者。这里是一个例子：</p>

<pre>// 使用由库提供的配置的默认值来创建实例
// 此时超时配置的默认值是 `0`
var instance = axios.create();

// 覆写库的超时默认值
// 现在，在超时前，所有请求都会等待 2.5 秒
instance.defaults.timeout = 2500;

// 为已知需要花费很长时间的请求覆写超时设置
instance.get('/longRequest', {
  timeout: 5000
});</pre>
<h3>拦截器</h3>
<p>在请求或响应被 then 或 catch 处理前拦截它们。</p>

<pre>// 添加请求拦截器
axios.interceptors.request.use(function (config) {
    // 在发送请求之前做些什么
    return config;
  }, function (error) {
    // 对请求错误做些什么
    return Promise.reject(error);
  });

// 添加响应拦截器
axios.interceptors.response.use(function (response) {
    // 对响应数据做点什么
    return response;
  }, function (error) {
    // 对响应错误做点什么
    return Promise.reject(error);
  });</pre>
<p>如果你想在稍后移除拦截器，可以这样：</p>

<pre>var myInterceptor = axios.interceptors.request.use(function () {/*...*/});
axios.interceptors.request.eject(myInterceptor);</pre>
<p>可以为自定义 axios 实例添加拦截器。</p>

<pre>var instance = axios.create();
instance.interceptors.request.use(function () {/*...*/});</pre>
<p>错误处理：</p>
<pre>axios.get('/user/12345')
  .catch(function (error) {
    if (error.response) {
      // 请求已发出，但服务器响应的状态码不在 2xx 范围内
      console.log(error.response.data);
      console.log(error.response.status);
      console.log(error.response.headers);
    } else {
      // Something happened in setting up the request that triggered an Error
      console.log('Error', error.message);
    }
    console.log(error.config);
  });</pre>
<p>可以使用 validateStatus 配置选项定义一个自定义 HTTP 状态码的错误范围。</p>

<pre>axios.get('/user/12345', {
  validateStatus: function (status) {
    return status &lt; 500; // 状态码在大于或等于500时才会 reject
  }
})</pre>
<h3>取消</h3>
<p>使用 cancel token 取消请求。</p>
<p> Axios 的 cancel token API 基于<a href="https://github.com/tc39/proposal-cancelable-promises" target="_blank" rel="nofollow noopener noreferrer">cancelable promises proposal</a>
 </p>

<p>可以使用 CancelToken.source 工厂方法创建 cancel token，像这样：</p>

<pre>var CancelToken = axios.CancelToken;
var source = CancelToken.source();

axios.get('/user/12345', {
  cancelToken: source.token
}).catch(function(thrown) {
  if (axios.isCancel(thrown)) {
    console.log('Request canceled', thrown.message);
  } else {
    // 处理错误
  }
});

// 取消请求（message 参数是可选的）
source.cancel('Operation canceled by the user.');</pre>
<p>还可以通过传递一个 executor 函数到 CancelToken 的构造函数来创建 cancel token：</p>

<pre>var CancelToken = axios.CancelToken;
var cancel;

axios.get('/user/12345', {
  cancelToken: new CancelToken(function executor(c) {
    // executor 函数接收一个 cancel 函数作为参数
    cancel = c;
  })
});

// 取消请求
cancel();</pre>
<p><strong>注意</strong>：可以使用同一个 cancel token 取消多个请求。</p>


<h3>请求时使用 application/x-www-form-urlencoded</h3>
<p>axios 会默认序列化 JavaScript 对象为 JSON。 如果想使用 application/x-www-form-urlencoded 格式，你可以使用下面的配置。</p>

<p><strong>浏览器</strong></p>
<p>在浏览器环境，你可以使用 URLSearchParams API：</p>

<pre>const params = new URLSearchParams();
params.append('param1', 'value1');
params.append('param2', 'value2');
axios.post('/foo', params);</pre>
<p>URLSearchParams 不是所有的浏览器均支持。</p>
 

<p>除此之外，你可以使用 qs 库来编码数据:</p>

<pre>const qs = require('qs');
axios.post('/foo', qs.stringify({ 'bar': 123 }));

// Or in another way (ES6),

import qs from 'qs';
const data = { 'bar': 123 };
const options = {
  method: 'POST',
  headers: { 'content-type': 'application/x-www-form-urlencoded' },
  data: qs.stringify(data),
  url,
};
axios(options);</pre>
<h3>Node.js 环境</h3>
<p>在 node.js里, 可以使用 querystring 模块:</p>

<pre>const querystring = require('querystring');
axios.post('http://something.com/', querystring.stringify({ foo: 'bar' }));</pre>
<p>当然，同浏览器一样，你还可以使用 qs 库。</p>

<h3>Promises</h3>
<p>axios 依赖原生的 ES6 Promise 实现而<a href="http://caniuse.com/promises" target="_blank" rel="nofollow noopener noreferrer">被支持</a>。</p><p>
 如果你的环境不支持 ES6 Promise，你可以使用 <a href="https://github.com/jakearchibald/es6-promise" target="_blank" rel="nofollow noopener noreferrer">polyfill</a>。</p>

<h3>TypeScript支持</h3>
<p>axios 包含 TypeScript 的定义。</p>

<pre>import axios from "axios";
axios.get("/user?ID=12345");</pre>			<!-- 其他扩展 -->
						
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